<template>
  <div class="component-upload-image">
    <el-upload :disabled="disabled" multiple :action="uploadImgUrl" list-type="picture-card"
      :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError"
      :on-exceed="handleExceed" name="file" :on-remove="handleRemove" :before-remove="beforeRemove" :show-file-list="true"
      :headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }">
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
      的文件 <span>（最多上传 {{ limit }} 张）</span>
    </div>
    <!-- 放大缩小形式图片预览 -->
    <el-image-viewer v-if="showViewer" :on-close="closeViewer" :z-index="99" :initialIndex="initialIndex"
      :url-list="srcList" />
    <!-- 普通图片预览 -->
    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script>
import {
  getToken
} from "@/utils/auth";

export default {
  props: {
    value: [String, Object, Array],
    //是否禁用
    disabled: {
      type: Boolean,
      default: false,
    },
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    uplateType: {
      type: String,
      default: '1',
    },
    previewType: { //预览图片类型 1:普通预览  2：可放大缩小 上一张下一张预览
      type: String,
      default: '1',
    },
    // 删除时是否询问 true:询问  false: 不询问
    deleteInquiry: {
      type: Boolean,
      default: false
    },
  },
  components: {
    'el-image-viewer': () => import('element-ui/packages/image/src/image-viewer')
  },
  data() {
    return {
      showViewer: false,
      initialIndex: 0,
      srcList: [],
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: '', // 上传的图片服务器地址
      // videoUploadUrl: process.env.VUE_APP_BASE_API + "/common/v1/upload",
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: []
    };
  },
  watch: {
    value: {
      handler(val) {
        // console.log('传入的图片',val)
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              if (item.indexOf(this.baseUrl) === -1) {
                item = {
                  name: item,
                  url: item
                };
              } else {
                item = {
                  name: item,
                  url: item
                };
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  created() {
    // console.log('this.uplateType', this.uplateType)
    if (this.uplateType == 2) {
      this.uploadImgUrl = process.env.VUE_APP_BASE_API + "/common/v1/upload/no/compression"
    } else {
      this.uploadImgUrl = process.env.VUE_APP_BASE_API + "/common/v1/upload"
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    closeViewer() {
      this.showViewer = false
    },
    openImg() {
      this.showViewer = true
    },
    //删除图片前
    beforeRemove() {
      if (this.deleteInquiry) {
        const p = new Promise((resolve, reject) => {
          this.$confirm('此操作将删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            resolve(true)
          }).catch(() => {
            reject(false)
          });
        })
        return p
      }
    },
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("successImg", this.listToString(this.fileList));
      }
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      console.log(res)
      this.uploadList.push({
        name: res.fileName,
        url: res.result.url
      });
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        // console.log(this.fileList)
        // console.log('this.listToString(this.fileList)', this.listToString(this.fileList))
        this.$emit("successImg", this.listToString(this.fileList), file);
        // this.loading.close();
      }
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$message.error(`文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`);
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      // this.loading = this.$loading({
      //   lock: true,
      //   text: "上传中",
      //   background: "rgba(0, 0, 0, 0.7)",
      // });
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError() {
      this.$message.error("上传图片失败，请重试");
      // this.loading.close();
    },
    // 预览
    handlePictureCardPreview(file) {
      if (this.previewType == 1) {
        this.dialogImageUrl = file.url;
        this.dialogVisible = true;
      } else {
        let arrnew = [];
        this.fileList.forEach((e, index) => {
          if (e.url == file.url) {
            this.initialIndex = index
          }
          arrnew.push(e.url)
        })
        this.srcList = arrnew
        this.openImg()
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url.replace(this.baseUrl, "") + separator;
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};

</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
